Qsaibati Mhd Loutify, Ibrahim Ousama
Syrian Private University, Collage of Dentistry, Damascus, Syria.
Dent Res J (Isfahan). 2014 Nov;11(6):624-30.
In dental practical classes, the acoustic environment is characterized by high noise levels in relation to other teaching areas. The aims of this study were to measure noise levels produced during the different dental learning clinics, by equipments used in dental learning areas under different working conditions and by used and brand new handpieces under different working conditions.
The noise levels were measured by using a noise level meter with a microphone, which was placed at a distance of 15 cm from a main noise source in pre-clinical and clinical areas. In laboratories, the microphone was placed at a distance of 15 cm and another reading was taken 2 m away. Noise levels of dental learning clinics were measured by placing noise level meter at clinic center. The data were collected, tabulated and statistically analyzed using t-tests. Significance level was set at 5%.
In dental clinics, the highest noise was produced by micro motor handpiece while cutting on acrylic (92.2 dB) and lowest noise (51.7 dB) was created by ultrasonic scaler without suction pump. The highest noise in laboratories was caused by sandblaster (96 dB at a distance of 15 cm) and lowest noise by stone trimmer when only turned on (61.8 dB at a distance of 2 m). There was significant differences in noise levels of the equipment's used in dental laboratories and dental learning clinics (P = 0.007). The highest noise level recorded in clinics was at pedodontic clinic (67.37 dB).
Noise levels detected in this study were considered to be close to the limit of risk of hearing loss 85 dB.
在牙科实践课程中，与其他教学区域相比，声学环境的特点是噪音水平较高。本研究的目的是测量不同牙科学习诊所、不同工作条件下牙科学习区域使用的设备以及不同工作条件下使用过的和全新的手机所产生的噪音水平。
使用带有麦克风的噪音水平仪测量噪音水平，麦克风放置在临床前和临床区域距主要噪音源15厘米处。在实验室中，麦克风放置在距噪音源15厘米处，并在2米远处进行另一读数。通过将噪音水平仪放置在诊所中心来测量牙科学习诊所的噪音水平。收集数据、制成表格并使用t检验进行统计分析。显著性水平设定为5%。
在牙科诊所中，微型电动手机在切割丙烯酸时产生的噪音最高（92.2分贝），而无抽吸泵的超声波洁牙器产生的噪音最低（51.7分贝）。实验室中噪音最高的是喷砂机（距15厘米处为96分贝），仅开启时噪音最低的是修整器（距2米处为61.8分贝）。牙科实验室和牙科学习诊所使用的设备的噪音水平存在显著差异（P = 0.007）。诊所记录的最高噪音水平出现在儿童牙科诊所（67.37分贝）。
本研究中检测到的噪音水平被认为接近听力损失风险极限85分贝。
